/usr/src/gcc-4.4/debian/patches/pr40133.diff is in gcc-4.4-source 4.4.7-8ubuntu1.
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libstdc++-v3/
2009-12-09 Paolo Carlini <paolo.carlini@oracle.com>
Matthias Klose <doko@ubuntu.com>
PR libstdc++/40133
* acinclude.m4 ([GLIBCXX_ENABLE_ATOMIC_BUILTINS]): On *-*-linux*,
*-*-kfreebsd*-gnu | *-*-gnu* targets do link tests when possible.
* configure: Regenerate.
Index: libstdc++-v3/acinclude.m4
===================================================================
--- a/src/libstdc++-v3/acinclude.m4 (revision 155104)
+++ b/src/libstdc++-v3/acinclude.m4 (working copy)
@@ -2438,8 +2438,7 @@
dnl that are used should be checked.
dnl
dnl Note:
-dnl libgomp and libgfortran do this with a link test, instead of an asm test.
-dnl see: CHECK_SYNC_FETCH_AND_ADD
+dnl libgomp and libgfortran use a link test, see CHECK_SYNC_FETCH_AND_ADD.
dnl
dnl Defines:
dnl _GLIBCXX_ATOMIC_BUILTINS_1
@@ -2451,12 +2450,120 @@
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
old_CXXFLAGS="$CXXFLAGS"
-
+
+ # Do link tests if possible, instead asm tests, limited to some platforms
+ atomic_builtins_link_tests=no
+ if test x$gcc_no_link != xyes; then
+ # Can do link tests. Limit to some tested platforms
+ case "$host" in
+ *-*-linux* | *-*-kfreebsd*-gnu | *-*-gnu*)
+ atomic_builtins_link_tests=yes
+ ;;
+ esac
+ fi
+
+ if test x$atomic_builtins_link_tests = xyes; then
+
+ # Do link tests.
+
+ CXXFLAGS="$CXXFLAGS -fno-exceptions"
+
+ AC_MSG_CHECKING([for atomic builtins for bool])
+ AC_CACHE_VAL(glibcxx_cv_atomic_bool, [
+ AC_TRY_LINK(
+ [ ],
+ [typedef bool atomic_type;
+ atomic_type c1;
+ atomic_type c2;
+ const atomic_type c3(0);
+ __sync_fetch_and_add(&c1, c2);
+ __sync_val_compare_and_swap(&c1, c3, c2);
+ __sync_lock_test_and_set(&c1, c3);
+ __sync_lock_release(&c1);
+ __sync_synchronize();],
+ [glibcxx_cv_atomic_bool=yes],
+ [glibcxx_cv_atomic_bool=no])
+ ])
+ if test $glibcxx_cv_atomic_bool = yes; then
+ AC_DEFINE(_GLIBCXX_ATOMIC_BUILTINS_1, 1,
+ [Define if builtin atomic operations for bool are supported on this host.])
+ fi
+ AC_MSG_RESULT($glibcxx_cv_atomic_bool)
+
+ AC_MSG_CHECKING([for atomic builtins for short])
+ AC_CACHE_VAL(glibcxx_cv_atomic_short, [
+ AC_TRY_LINK(
+ [ ],
+ [typedef short atomic_type;
+ atomic_type c1;
+ atomic_type c2;
+ const atomic_type c3(0);
+ __sync_fetch_and_add(&c1, c2);
+ __sync_val_compare_and_swap(&c1, c3, c2);
+ __sync_lock_test_and_set(&c1, c3);
+ __sync_lock_release(&c1);
+ __sync_synchronize();],
+ [glibcxx_cv_atomic_short=yes],
+ [glibcxx_cv_atomic_short=no])
+ ])
+ if test $glibcxx_cv_atomic_short = yes; then
+ AC_DEFINE(_GLIBCXX_ATOMIC_BUILTINS_2, 1,
+ [Define if builtin atomic operations for short are supported on this host.])
+ fi
+ AC_MSG_RESULT($glibcxx_cv_atomic_short)
+
+ AC_MSG_CHECKING([for atomic builtins for int])
+ AC_CACHE_VAL(glibcxx_cv_atomic_int, [
+ AC_TRY_LINK(
+ [ ],
+ [typedef int atomic_type;
+ atomic_type c1;
+ atomic_type c2;
+ const atomic_type c3(0);
+ __sync_fetch_and_add(&c1, c2);
+ __sync_val_compare_and_swap(&c1, c3, c2);
+ __sync_lock_test_and_set(&c1, c3);
+ __sync_lock_release(&c1);
+ __sync_synchronize();],
+ [glibcxx_cv_atomic_int=yes],
+ [glibcxx_cv_atomic_int=no])
+ ])
+ if test $glibcxx_cv_atomic_int = yes; then
+ AC_DEFINE(_GLIBCXX_ATOMIC_BUILTINS_4, 1,
+ [Define if builtin atomic operations for int are supported on this host.])
+ fi
+ AC_MSG_RESULT($glibcxx_cv_atomic_int)
+
+ AC_MSG_CHECKING([for atomic builtins for long long])
+ AC_CACHE_VAL(glibcxx_cv_atomic_long_long, [
+ AC_TRY_LINK(
+ [ ],
+ [typedef long long atomic_type;
+ atomic_type c1;
+ atomic_type c2;
+ const atomic_type c3(0);
+ __sync_fetch_and_add(&c1, c2);
+ __sync_val_compare_and_swap(&c1, c3, c2);
+ __sync_lock_test_and_set(&c1, c3);
+ __sync_lock_release(&c1);
+ __sync_synchronize();],
+ [glibcxx_cv_atomic_long_long=yes],
+ [glibcxx_cv_atomic_long_long=no])
+ ])
+ if test $glibcxx_cv_atomic_long_long = yes; then
+ AC_DEFINE(_GLIBCXX_ATOMIC_BUILTINS_8, 1,
+ [Define if builtin atomic operations for long long are supported on this host.])
+ fi
+ AC_MSG_RESULT($glibcxx_cv_atomic_long_long)
+
+ else
+
+ # Do asm tests.
+
# Compile unoptimized.
CXXFLAGS='-O0 -S'
- # Fake what AC_TRY_COMPILE does, without linking as this is
- # unnecessary for a builtins test.
+ # Fake what AC_TRY_COMPILE does.
cat > conftest.$ac_ext << EOF
[#]line __oline__ "configure"
@@ -2478,14 +2585,14 @@
AC_MSG_CHECKING([for atomic builtins for bool])
if AC_TRY_EVAL(ac_compile); then
if grep __sync_ conftest.s >/dev/null 2>&1 ; then
- enable_atomic_builtinsb=no
+ glibcxx_cv_atomic_bool=no
else
AC_DEFINE(_GLIBCXX_ATOMIC_BUILTINS_1, 1,
[Define if builtin atomic operations for bool are supported on this host.])
- enable_atomic_builtinsb=yes
+ glibcxx_cv_atomic_bool=yes
fi
fi
- AC_MSG_RESULT($enable_atomic_builtinsb)
+ AC_MSG_RESULT($glibcxx_cv_atomic_bool)
rm -f conftest*
cat > conftest.$ac_ext << EOF
@@ -2508,14 +2615,14 @@
AC_MSG_CHECKING([for atomic builtins for short])
if AC_TRY_EVAL(ac_compile); then
if grep __sync_ conftest.s >/dev/null 2>&1 ; then
- enable_atomic_builtinss=no
+ glibcxx_cv_atomic_short=no
else
AC_DEFINE(_GLIBCXX_ATOMIC_BUILTINS_2, 1,
[Define if builtin atomic operations for short are supported on this host.])
- enable_atomic_builtinss=yes
+ glibcxx_cv_atomic_short=yes
fi
fi
- AC_MSG_RESULT($enable_atomic_builtinss)
+ AC_MSG_RESULT($glibcxx_cv_atomic_short)
rm -f conftest*
cat > conftest.$ac_ext << EOF
@@ -2539,14 +2646,14 @@
AC_MSG_CHECKING([for atomic builtins for int])
if AC_TRY_EVAL(ac_compile); then
if grep __sync_ conftest.s >/dev/null 2>&1 ; then
- enable_atomic_builtinsi=no
+ glibcxx_cv_atomic_int=no
else
AC_DEFINE(_GLIBCXX_ATOMIC_BUILTINS_4, 1,
[Define if builtin atomic operations for int are supported on this host.])
- enable_atomic_builtinsi=yes
+ glibcxx_cv_atomic_int=yes
fi
fi
- AC_MSG_RESULT($enable_atomic_builtinsi)
+ AC_MSG_RESULT($glibcxx_cv_atomic_int)
rm -f conftest*
cat > conftest.$ac_ext << EOF
@@ -2569,22 +2676,23 @@
AC_MSG_CHECKING([for atomic builtins for long long])
if AC_TRY_EVAL(ac_compile); then
if grep __sync_ conftest.s >/dev/null 2>&1 ; then
- enable_atomic_builtinsll=no
+ glibcxx_cv_atomic_long_long=no
else
AC_DEFINE(_GLIBCXX_ATOMIC_BUILTINS_8, 1,
[Define if builtin atomic operations for long long are supported on this host.])
- enable_atomic_builtinsll=yes
+ glibcxx_cv_atomic_long_long=yes
fi
fi
- AC_MSG_RESULT($enable_atomic_builtinsll)
+ AC_MSG_RESULT($glibcxx_cv_atomic_long_long)
rm -f conftest*
+ fi
CXXFLAGS="$old_CXXFLAGS"
AC_LANG_RESTORE
# Set atomicity_dir to builtins if either of above tests pass.
- if test $enable_atomic_builtinsi = yes || test $enable_atomic_builtinsb = yes ; then
+ if test $glibcxx_cv_atomic_int = yes || test $glibcxx_cv_atomic_bool = yes ; then
atomicity_dir=cpu/generic/atomicity_builtins
fi
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